Thanks for your updates and for working through the solution on your own before I could respond.
You asked “Should this be in the template or the post/page itself?” I regret that my example was not completely clear. The mla_caption
parameter goes in the shortcode itself. For the shortcode you posted, it would look like:
[mla_gallery size=icon_only post_mime_type=application/pdf columns=2 mla_markup=pdf-table link=file post_parent=all attachment_category='unliquidated-cash-advances']
mla_caption='<a href="{+file_url+}" target="_blank">{+title+}</a>'
[/mla_gallery]
I’ve used the “enclosing shortcode” syntax, as in my earlier post.
Adding the parameter to your template is a great alternative; you can use the template in as many shortcodes as you need to without duplicating the mla_caption
parameter in each one.
I will leave this topic resolved, but please update it if you have any other problems or questions. Thanks for your positive feedback on the plugin.